Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

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RELATED PARTY TRANSACTIONS (Details)
 3 Months Ended 6 Months Ended
May 01, 2024
USD ($)
$ / shares
shares
Oct. 30, 2020
component
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Related Party Transaction [Line Items]              
Services expenses     $ 5,179,000 $ 4,912,000 $ 10,207,000 $ 9,767,000  
Waiver of internal administrative services expenses     2,361,000 2,394,000 4,472,000 4,283,000  
Internal administrative services expenses     2,520,000 2,545,000 4,787,000 4,584,000  
Accounts payable and other liabilities     738,000   738,000   $ 255,000
Related Party | MSC Income | Advisory Agreement              
Related Party Transaction [Line Items]              
Base fee rate (as a percent)   1.75%          
Number of components related to incentive fee | component   2          
Related Party | MSC Income | Advisory Agreement, Incentive Rate, Pre-Incentive Fee Net Investment Income              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   20.00%          
Related Party | MSC Income | Advisory Agreement - Incentive Rate, Quarterly Hurdle Rate              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   1.875%          
Related Party | MSC Income | Advisory Agreement - Incentive Rate, Annualized Hurdle Rate              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   7.50%          
Related Party | MSC Income | Advisory Agreement, Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   100.00%          
Related Party | MSC Income | Advisory Agreement - Incentive Rate, Quarterly Catch-Up Threshold              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   2.34375%          
Related Party | MSC Income | Advisory Agreement - Incentive Rate, Annualized Catch-Up Threshold              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   9.375%          
Related Party | MSC Income | Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold              
Related Party Transaction [Line Items]              
Incentive fee rate (as a percent)   20.00%          
Related Party | MSC Income | Advisory Agreement - Base Management Fees              
Related Party Transaction [Line Items]              
Services expenses     5,200,000 4,900,000 10,200,000 9,800,000  
Related Party | MSC Income | Advisory Agreement - Subordinated Incentive Fees              
Related Party Transaction [Line Items]              
Services expenses     3,600,000 3,600,000 7,200,000 6,300,000  
Related Party | MSC Income | Advisory Agreement - Incentive Fees, Capital Gains Fees              
Related Party Transaction [Line Items]              
Services expenses     0 0 0 0  
Related Party | MSC Income | Advisory Agreement - Internal Administrative Services              
Related Party Transaction [Line Items]              
Services expenses     2,500,000 2,500,000 4,800,000 4,600,000  
Waiver of internal administrative services expenses     2,400,000 2,400,000 $ 4,500,000 $ 4,300,000  
Related Party | MSC Income - HMS Adviser | Offering Costs              
Related Party Transaction [Line Items]              
Percentage of payment of offering costs (as a percent)         1.50%    
Accounts payable and other liabilities     $ 600,000   $ 600,000    
Fee paid indirectly       $ 100,000      
Related Party | Main Street | Dividend Reinvestment Plan              
Related Party Transaction [Line Items]              
Sale of stock, number of shares (in shares) | shares 315,259            
Sale of stock, price per share (in dollars per share) | $ / shares $ 7.93            
Sale of stock, proceeds $ 2,500,000